To improve throughput by reducing the resource used for transmitting a parameter relating to retransmission control and decreasing the overhead of retransmission control signaling. In a case where a retransmission control method is employed in consideration of adaptive MCS control in which the encoding rate can be changed, the scheduling section sets the MCS in accordance with CQI notified from the communication counterpart apparatus. When transmission data is encoded, the RV parameter bit-number setting section sets the number of bits used for signaling the RV parameter to decrease as the encoding rate of the first transmission is decreased and sets the RV parameter based on the number of bits. For example, in a case where the encoding rate R is R>2/3, two bits are set. In a case where the encoding rate 1/3<R≦2/3, one bit is set. On the other hand, in a case where R≦1/3, zero bits is set.
Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A wireless communication apparatus comprising: an MCS setting section that sets an MCS (Modulation and Coding Scheme) for data; an encoding section that encodes the data; an RV (redundancy version) parameter setting section that sets an RV parameter indicating a start position of transmission data to be transmitted in the data; and a transmission processing section that transmits control information, which includes the MCS and RV information indicating the RV parameter, and the transmission data, wherein: when a number of bits of the RV information is two, the RV parameter is set to any one among 0, 1, 2 and 3; and when a number of bits of the RV information is zero, the control information includes no RV information and the RV parameter is set to 0.
A wireless transmitter sets a Modulation and Coding Scheme (MCS) for data and encodes the data. It also sets a Redundancy Version (RV) parameter, which indicates the starting point for transmitting data in retransmissions. The transmitter sends control information (including the MCS and RV information) along with the data. If the RV information uses two bits, the RV parameter can be 0, 1, 2, or 3. If the RV information uses zero bits, the control information excludes the RV information, and the RV parameter defaults to 0. This reduces overhead by dynamically adjusting the RV parameter signaling.
2. The wireless communication apparatus according to claim 1 , wherein the number of bits is set in accordance with an encoding rate of the data.
The wireless transmitter described above adjusts the number of bits used for the RV parameter based on the encoding rate of the data. Specifically, the number of bits allocated to the RV parameter is determined by the current encoding rate. This allows for optimization, reducing overhead when lower encoding rates are used, as described in the previous claim relating to setting an RV parameter indicating a start position of transmission data.
3. The wireless communication apparatus according to claim 1 , wherein the number of bits is smaller as an encoding rate of the data is lower.
In the wireless transmitter described in the first claim, the number of bits used for the RV parameter is reduced when the encoding rate is lower. A lower encoding rate results in fewer bits being used for signaling the RV parameter. This optimization allows for decreased overhead in retransmission control as mentioned in the abstract.
4. The wireless communication apparatus according to claim 1 , wherein the number of bits is set to zero when an encoding rate of the data is equal to or lower than a predetermined value.
Using the wireless transmitter from claim 1, if the encoding rate for the data falls below a certain threshold, the RV parameter is not signaled at all; the number of bits used to represent it is set to zero. This is a further optimization to reduce signaling overhead when the encoding rate is low, building on the method for setting RV parameters described earlier.
5. The wireless communication apparatus according to claim 1 , wherein: the wireless communication apparatus performs communication using a plurality of code words; and the number of bits is set for each of the plurality of code words, and the number of bits is smaller for a code word having a lower encoding rate out of the plurality of code words.
The wireless transmitter described previously uses multiple "codewords" for communication. For each codeword, it sets the number of bits for the RV parameter independently. Codewords with lower encoding rates are assigned fewer bits for their RV parameters. This approach allows for finer-grained control over overhead reduction across multiple data streams, which relates to setting an RV parameter indicating a start position of transmission data in each of the codewords.
6. The wireless communication apparatus according to claim 5 , wherein a total number of bits of the RV information for the plurality of code words is constant.
Expanding on the multi-codeword wireless transmitter from claim 5, the total number of bits allocated to RV information across all codewords remains constant. Even though individual codewords might have varying numbers of RV parameter bits based on their encoding rates, the overall RV overhead is fixed. Thus, the individual adjustment according to claim 5 does not change the RV overhead, only how it is distributed.
7. The wireless communication apparatus according to claim 5 , wherein the number of bits of a code word having an encoding rate, which is equal to or lower than a predetermined value, out of the plurality of code words is set to zero.
Further refining the multi-codeword wireless transmitter from claim 5, if a codeword's encoding rate falls below a predefined threshold, its RV parameter is not signaled at all (zero bits). This is another mechanism for reducing overhead, specifically targeting codewords with very low encoding rates as discussed in the initial claim.
8. The wireless communication apparatus according to claim 1 , wherein: the wireless communication apparatus performs communication using one or a plurality of streams for each of a plurality of code words; and the number of bits is set for each of the plurality of code words, and the number of bits is smaller for a code word having a smaller number of streams at a first transmission out of the plurality of code words.
The wireless transmitter sends data using one or more "streams" for each codeword. The number of RV parameter bits is set independently for each codeword. Codewords with fewer streams at the first transmission are assigned fewer RV parameter bits. This enables finer-grained control over overhead reduction based on the number of streams, similar to reducing bits based on the encoding rate, described previously.
9. The wireless communication apparatus according to claim 8 , wherein a total number of bits of the RV information for the plurality of code words is constant.
Building on the multi-codeword, multi-stream wireless transmitter of claim 8, the total number of RV parameter bits across all codewords remains constant, even though individual codewords have varying numbers of RV parameter bits based on their number of streams. The total overhead for RV information remains the same, regardless of how it is distributed among codewords according to the number of streams per codeword.
10. The wireless communication apparatus according to claim 8 , wherein the number of bits of a code word having a number of streams at a first transmission, which is equal to or smaller than a predetermined value, out of the plurality of code words is set to zero.
In the wireless transmitter utilizing multiple codewords and streams from claim 8, if a codeword has a number of streams below a threshold at the initial transmission, its RV parameter is not signaled (zero bits). This is a mechanism for reducing overhead, applied specifically to codewords with a small number of streams.
11. The wireless communication apparatus according to claim 1 , wherein said RV parameter setting section varies the RV parameter in accordance with a number of retransmissions of the data.
In the initial wireless transmitter implementation in claim 1, the RV parameter is modified according to how many times the data has already been retransmitted. The RV parameter setting adapts based on the retransmission count.
12. The wireless communication apparatus according to claim 1 , wherein the RV parameter is set to 0 at a first transmission.
In the wireless transmitter, the initial transmission of data always uses an RV parameter value of 0. Subsequent retransmissions may use different RV parameter values, but the first transmission always starts with RV=0. This refers to setting an RV parameter indicating a start position of transmission data.
13. The wireless communication apparatus according to claim 1 , wherein the RV parameter indicates the different start position in accordance with a value of the RV parameter.
The different numerical values of the RV parameter each indicate a different starting location within the data for the retransmission. An RV parameter of 1, 2, or 3 (when two bits are allocated) means that the transmission will start at a different position within the original data.
14. The wireless communication apparatus according to claim 1 , wherein the start position, which the RV parameter that is 0 indicates, is a position that is closer to a beginning of the data.
When the RV parameter is set to 0, it points to a starting position within the data that is closer to the very beginning of the data. This is in contrast to RV parameter values of 1, 2, or 3 which would point to locations later in the data block.
15. The wireless communication apparatus according to claim 1 , wherein transmission data, the start position of which the RV parameter that is 0 indicates, has a more number of systematic bits.
Transmission data starting at the position indicated by an RV parameter of 0 contains a greater number of "systematic bits". Systematic bits are the original, uncoded data bits, as opposed to parity or redundant bits added for error correction, hence the position indicated by RV=0 will transmit more of the original uncoded data bits.
16. A wireless communication method comprising: setting an MCS (Modulation and Coding Scheme) for data; encoding the data; setting an RV (redundancy version) parameter indicating a start position of transmission data to be transmitted in the data; and transmitting control information, which includes the MCS and RV information indicating the RV parameter, and the transmission data, wherein: when a number of bits of the RV information is two, the RV parameter is set to any one among 0, 1, 2 and 3; and when a number of bits of the RV information is zero, the control information includes no RV information and the RV parameter is set to 0.
A wireless transmission method involves setting an MCS (Modulation and Coding Scheme) for data, encoding the data, and setting an RV (Redundancy Version) parameter to indicate the starting position for transmitting data. Control information (including MCS and RV information) and the data are transmitted. If the RV information uses two bits, the RV parameter is set to 0, 1, 2, or 3. If the RV information uses zero bits, the control information excludes RV information, and the RV parameter defaults to 0. The method effectively reduces overhead in retransmissions.
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March 10, 2009
September 10, 2013
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